Parameterized filters and signaling techniques

A method of upsampling spatially scalable video information, the method comprising, with a computing device that implements a video processing tool:

• receiving upsampling filter information for plural upsampling filters,
• using the upsampling filter information, determining at least two effective filter tap calculation parameters for each of the plural upsampling filters;
• receiving encoded video sample information;
• and
• upsampling the video sample information using the plural upsampling filters, each of the plural upsampling filters having at least four filter taps, wherein for each of the plural upsampling filters:
• the at least four filter taps are calculated with the at least two effective filter tap calculation parameters prior to the upsampling, and
• the at least four filter taps are greater in number than the at least two effective filter tap calculation parameters from which the plural filter taps are calculated.

A method comprising, with a computing device that implements a media processing tool:

• signaling filter information in a bitstream, wherein the filter information comprises information for a set of plural filters in a filter family, wherein each of the plural filters comprises plural filter taps, and wherein the signaling of the filter information comprises:
• signaling one or more family parameters for the filter family;
• and
• for each of the plural filters, signaling one or more filter tap parameters from which the plural filter taps of the filter can be derived, wherein the one or more filter tap parameters for the filter are fewer in number than the plural filter taps of the filter.

A method of filtering media information, the method comprising, with a computing device that implements a media processing tool:

• receiving filter information for one or more filters, wherein the filter information is signaled in a bitstream received by the computing device that implements the media processing tool, and wherein the one or more filters comprise filters with different phases or fractional sample delays in a filter family;
• for each of the one or more filters, calculating plural filter taps using the filter information, wherein the plural filter taps for the filter are specified by one or more filter coefficient parameters for the filter, and wherein the plural filter taps are greater in number than the one or more filter coefficient parameters from which the plural filter taps are calculated;
• and
• filtering media information using the one or more filters.

A method of filtering media information, the method comprising, with a computing device that implements a media processing tool:

• receiving filter information for one or more filters, wherein the filter information is signaled in a bitstream received by the computing device that implements the media processing tool;
• for each of the one or more filters, calculating plural filter taps using the filter information, wherein the plural filter taps for the filter are specified by one or more filter coefficient parameters for the filter, wherein the plural filter taps are greater in number than the one or more filter coefficient parameters from which the plural filter taps are calculated, and wherein the one or more filter coefficient parameters are calculated by:
• identifying a constraint for the filter;
• and
• based on the identified constraint, identifying the one or more filter coefficient parameters;
• and
• filtering media information using the one or more filters.

A computing device that implements a media processing tool, the computing device comprising a processor, memory, and computer-readable storage media storing computer-executable instructions for causing the computing device that implements the media processing tool to perform a method of filtering media information, the method comprising:

• receiving filter information for one or more filters, wherein the filter information is signaled in a bitstream received by the computing device that implements the media processing tool, and wherein the filter information includes:
• one or more filter family parameters selected from the group comprising number of filters parameter, resolution parameter, scaling bits parameter, and full integer position filter present parameter;
• and
• for each of the one or more filters, one or more signaled filter parameters used to determine one or more filter coefficient parameters from which plural filter taps are calculated;
• for each of the one or more filters, calculating the plural filter taps for the filter using the filter information, wherein the plural filter taps for the filter are specified by the one or more filter coefficient parameters for the filter, and wherein the plural filter taps are greater in number than the one or more filter coefficient parameters from which the plural filter taps are calculated;
• and
• filtering media information using the one or more filters.

A computing device that implements a media processing tool, the computing device comprising a processor, memory, and computer-readable storage media storing computer-executable instructions for causing the computing device that implements the media processing tool to perform a method comprising:

• signaling filter information in a bitstream, wherein the filter information comprises information for a set of plural filters in a filter family, wherein each of the plural filters comprises plural filter taps, and wherein the signaling of the filter information comprises:
• signaling one or more family parameters for the filter family;
• and
• for each of the plural filters, signaling one or more filter tap parameters from which the plural filter taps of the filter can be derived, wherein the one or more filter tap parameters for the filter are fewer in number than the plural filter taps of the filter.

A computing device that implements a media processing tool, the computing device comprising a processor, memory, and computer-readable storage media storing computer-executable instructions for causing the computing device that implements the media processing tool to perform a method of filtering media information, the method comprising:

• receiving filter information for one or more filters, wherein the filter information is signaled in a bitstream received by the computing device that implements the media processing tool, and wherein the one or more filters comprise filters with different phases or fractional sample delays in a filter family;
• for each of the one or more filters, calculating plural filter taps using the filter information, wherein the plural filter taps for the filter are specified by one or more filter coefficient parameters for the filter, and wherein the plural filter taps are greater in number than the one or more filter coefficient parameters from which the plural filter taps are calculated;
• and
• filtering media information using the one or more filters.